As far as I know, the 820 is a Windows only PPA printer
that does not contain a PCL interpreter; therefore, the
application and the printer driver have to do it for you.
For example, in MS Word or MS Publisher you can select
text color under FORMAT -> FONT -> FONT COLOR.
For PCL inkjets, there is the foreground color command
in the form
<esc>*v#S
where the # is the index value for the color. Legal values
are:
0 - Black
1 - Cyan
2 - Magenta
3 - Blue
4 - Yellow
5 - Green
6 - Red
If you wand Red text the enter <esc>*v6S and then later
should you want black text... <esc>*v0S
Jim Asman